听) 三大听力练习网站: http://www.npr.org/templates/topics/topic.php?topicId=1001 http://www.discovery.com/radio/radio.html http://www.chinadaily.com.cn/language_tips/auvideo/audio_bbc.html
说) 三大正宗美语发音练习工具: http://www.uiowa.edu/~acadtech/phonetics/english/frameset.html http://evaeaston.com/pr/home.html http://www.manythings.org/pp/
读) 三大知识查询工具: http://en.wikipedia.org/wiki/Wikipedia http://images.google.com/imghp?hl=en&tab=wi http://education.yahoo.com/reference/dictionary/
写) 一个就够用了: http://owl.english.purdue.edu/